|MadSci Network: Genetics|
In each human cell there are 46 chromosomes. 22 pairs and the x and the y chromosome possibility. Chromosome thirteen refers to the thirtheenth pair of chromosomes in the human cell. Everyone has two of these chromosomes. The difference between a boy and a girl is that the girl has two X chromosomes for the 23 pair where a boy has one x and one y for the thwenty-third pair. I hope this helps you with your project. Michael Watson
Try the links in the MadSci Library for more information on Genetics.